exam Maths Puzzle Numerical Ability

I need help with this quadric formula

x2-2x+8=0

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exam Other Question

How do you multiply this set of matrices?

[5 4 8] /</sub> {-8 6}
[3 -4 -2] /</sup> { 0 -2}

The first matrix is a 2x3 and the second one is a 2x2.</PRE> Solve for x: log{base10}(log{base2}(log{base x}25))= 0